CN106710532A - Backlight drive circuit and liquid-crystal display - Google Patents
Backlight drive circuit and liquid-crystal display Download PDFInfo
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- CN106710532A CN106710532A CN201710089993.8A CN201710089993A CN106710532A CN 106710532 A CN106710532 A CN 106710532A CN 201710089993 A CN201710089993 A CN 201710089993A CN 106710532 A CN106710532 A CN 106710532A
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- 239000004973 liquid crystal related substance Substances 0.000 title claims description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 57
- 230000005611 electricity Effects 0.000 claims description 12
- 238000004146 energy storage Methods 0.000 claims description 10
- 230000015556 catabolic process Effects 0.000 claims description 7
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims 1
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- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133612—Electrical details
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mathematical Physics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal Display Device Control (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The present invention provides a backlight drive circuit. The backlight drive circuit comprises a voltage conversion circuit, a PWM controller, a voltage stabilizing diode, a first electric switch, an optocoupler unit, a boost switch and a light source driving assembly. The voltage conversion circuit is configured to supply voltage to the optocoupler unit, the PWM controller, the boost switch and the light source. The PWM controller is configured to control the output of the voltage conversion circuit, the light source driving assembly is connected with the boost switch and the light source to control the switching of the boost switch according to the condition of the light source, the cathode of the voltage stabilizing diode is connected with the optocoupler unit, the anode of the voltage stabilizing diode is connected with the control end of the first electric switch, the first end of the first electric switch is connected with the PWM controller, the second end of the first electric switch is earthed, when the boost switch shorts out, the current outputted by the voltage conversion circuit is increased, the optocoupler unit breaks down the voltage stabilizing diode to conduct the first electric switch, and the PWM controller stops, the boost switch is cut off, and therefore the surface temperature of the boost switch is reduced to satisfy the safety standard of the safety regulation.
Description
Technical field
The present invention relates to a kind of display technology field, more particularly, to a kind of backlight drive circuit and liquid crystal display.
Background technology
In present panel design, the proportion shared by large scale product gradually increases.Driving large scale product such as TV
Backlight electric power circuit it is more complicated.Wherein, in existing television backlight drive circuit, the boosting of light emitting diode drives
Switching tube can be short-circuited phenomenon, using the method for primary overpower protection, PWM collection generally in backlight drive circuit
Restarted every a period of time into chip, so as to cause the temperature of driving switch pipe surface too high, so as to be unsatisfactory for the peace of safety
Full standard.
The content of the invention
It is an object of the invention to provide a kind of backlight drive circuit, peace is met to reduce the temperature of driving switch pipe
The safety standard of rule.
Another object of the present invention is to provide a kind of liquid crystal display.
To achieve these goals, embodiment of the present invention provides following technical scheme：
The present invention provides a kind of backlight drive circuit, is applied in liquid crystal display, and the backlight drive circuit includes electricity
Voltage conversion circuit, PWM controller, voltage-regulator diode, the first electric switch, optocoupler unit, boosted switch and light source drive component, institute
Voltage conversion circuit is stated for connecting Input voltage terminal, to receive input voltage, and voltage conversion is carried out to input voltage, it is described
Voltage conversion circuit is additionally coupled to the light source of the optocoupler unit, PWM controller, the boosted switch and liquid crystal display, with
The optocoupler unit, PWM controller, the boosted switch and light source are given by the voltage output after conversion, the PWM controller is used
In the output for controlling the voltage conversion circuit, the light source drive component is connected to the boosted switch and the light source, with
The negative electrode of the break-make of the boosted switch, the voltage-regulator diode is controlled to be connected to the optocoupler unit according to light source situation,
The anode of the voltage-regulator diode is connected to the control end of first electric switch, and the first end of first electric switch is connected to
The PWM controller, the second end ground connection of first electric switch, when boosted switch short circuit, the voltage conversion electricity
The electric current increase of road output, the optocoupler unit feeds back to the voltage of voltage-regulator diode more than breakdown voltage, the pole of the voltage stabilizing two
Pipe is turned on, and then first electric switch is turned on, and the PWM controller is stopped to end the boosted switch.
Wherein, the voltage conversion circuit includes transformer, the second electric switch, first resistor, the first electric capacity, the one or two pole
Pipe, the second diode and second resistance, the Input voltage terminal are connected to the first end of the first primary coil of the transformer,
And the negative electrode of first diode is connected to by the first resistor, first electric capacity is connected in parallel on the first resistor
Two ends, the anode of first diode is connected to the first end of second electric switch, and the anode of first diode is also
The second end of the first primary coil of the transformer is connected to, the control end of second electric switch is connected to the PWM controls
Device processed, the second end ground connection of second electric switch, the first end of the second primary coil of the transformer is connected to described the
The anode of two diodes, the negative electrode of second diode is connected to the voltage of the PWM controller by the second resistance
End, the voltage end of the PWM controller is connected to the first end of first electric switch, the secondary coil connection of the transformer
To the first end of the boosted switch.
Wherein, the light source drive component includes the 3rd electric switch, control unit and 3rd resistor, the 3rd electric switch
Control end be connected to described control unit, the first end of the 3rd electric switch is connected to the light source, and the described 3rd establishes by cable
The second end closed is grounded by the 3rd resistor, and described control unit is additionally coupled to the boosted switch, with according to described the
The voltage condition of three resistance controls the break-make of the boosted switch.
Wherein, the optocoupler unit include the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, voltage adjuster and
Optocoupler, the 4th resistance and the 5th resistant series are in the secondary coil of the transformer and the first end of voltage adjuster
Between, the second end ground connection of the voltage adjuster, the 6th resistance and the 7th resistance are connected to the transformer
Between secondary coil and ground, the reference edge of the voltage adjuster is connected between the 6th resistance and the 7th resistance
Node, the anode of the light emitting diode of the optocoupler is connected to the node between the 4th resistance and the 5th resistance, institute
State the node that the negative electrode of the light emitting diode of optocoupler is connected between the 5th resistance and the voltage adjuster, the optocoupler
The first end of switch be connected to the negative electrode of the PWM controller and the voltage-regulator diode, the second of the switch of the optocoupler
End ground connection.
Wherein, the voltage conversion circuit also includes the 3rd diode, the 4th diode and second electric capacity, described the
The anode of three diodes is connected to the anode of the 4th diode, and is connected to the first of the secondary coil of the transformer
End, the negative electrode of the 3rd diode is connected to the anode of the 4th diode, and is connected to the positive pole of second electric capacity,
The negative pole ground connection of second electric capacity, the second end ground connection of the secondary coil of the transformer.
Wherein, the voltage conversion circuit also includes the 3rd electric capacity and the 4th electric capacity, and the positive pole of the 3rd electric capacity is connected
To the Input voltage terminal, the negative pole of the 3rd electric capacity is grounded, and the 4th electric capacity is connected in parallel on the two ends of the 3rd electric capacity.
Wherein, the backlight drive circuit also includes the 5th electric capacity and the 6th electric capacity, and the positive pole of the 5th electric capacity passes through
The second resistance is connected to the negative electrode of second diode, and the negative pole of the 5th electric capacity is grounded, the 6th electric capacity
Positive pole is connected to the negative electrode of the 3rd diode, the negative pole ground connection of the 6th electric capacity.
Wherein, the backlight drive circuit also includes the 5th diode, energy storage inductor and the 7th electric capacity, the five or two pole
The anode of pipe is connected to the negative electrode of the 3rd diode and the 4th diode, the 5th diode by the energy storage inductor
Negative electrode be connected to the anode of the light source, the negative electrode of the light source is connected to the first end of the 3rd electric switch, described
The negative electrode of five diodes is additionally coupled to the positive pole of the 7th electric capacity, the negative pole ground connection of the 7th electric capacity.
Wherein, the boosted switch, second electric switch and the 3rd electric switch are NPN transistor, described
Boosted switch, the control end of second electric switch and the 3rd electric switch, first end and the second end are respectively grid, drain electrode
And source electrode, first electric switch is NPN type triode, the control end of first electric switch, first end and the second end difference
It is base stage, colelctor electrode and emitter stage.
The present invention also provides a kind of liquid crystal display, including light source and above-mentioned backlight drive circuit, the backlight drive
Circuit is connected to the light source.
The embodiment of the present invention has the following advantages that or beneficial effect：
A kind of backlight drive circuit of the invention, including voltage conversion circuit, PWM controller, voltage-regulator diode, the first electricity
Switch, optocoupler unit, boosted switch and light source drive component, the voltage conversion circuit are used to connect Input voltage terminal, to connect
Input voltage is received, and voltage conversion is carried out to input voltage, the voltage conversion circuit is additionally coupled to the optocoupler unit, PWM
The light source of controller, the boosted switch and liquid crystal display, the optocoupler unit, PWM are given by the voltage output after conversion
Controller, the boosted switch and light source, the PWM controller are used to control the output of the voltage conversion circuit, the light
Source drive component is connected to the boosted switch and the light source, to control the logical of the boosted switch according to light source situation
Disconnected, the negative electrode of the voltage-regulator diode is connected to the optocoupler unit, and the anode of the voltage-regulator diode is connected to described first
The control end of electric switch, the first end of first electric switch is connected to the PWM controller, the second of first electric switch
End ground connection, when boosted switch short circuit, the electric current increase of the voltage conversion circuit output, the optocoupler unit feeds back to
The voltage of the voltage-regulator diode is more than breakdown voltage, the voltage-regulator diode conducting, and then first electric switch and turns on, institute
PWM controller is stated to be stopped to end the boosted switch.The boosted switch surface temperature reduction, not only meets safety
Safety standard, also achieve overcurrent protection.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of electricity of backlight drive circuit with overcurrent protection function that first aspect of the present invention embodiment is provided
Lu Tu；
Fig. 2 is a kind of block diagram of liquid crystal display that second aspect of the present invention embodiment is provided.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Base
Embodiment in the present invention, it is all that those of ordinary skill in the art are obtained on the premise of creative work is not made
Other embodiments, belong to the scope of protection of the invention.
Additionally, the explanation of following embodiment is with reference to additional diagram, it is used to illustrate the spy that the present invention may be used to implement
Determine embodiment.The direction term being previously mentioned in the present invention, for example, " on ", D score, "front", "rear", "left", "right", " interior ",
" outward ", " side " etc., is only the direction with reference to annexed drawings, therefore, the direction term for using is to more preferably, more clearly say
The bright and understanding present invention, must be with specific orientation, with specific square rather than the device or element for indicating or infer meaning
Position construction and operation, therefore be not considered as limiting the invention.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Company ", " connection " should be interpreted broadly, for example, it may be being fixedly connected, or detachably connected, or integratedly connect
Connect；Can mechanically connect；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, can be in two elements
The connection in portion.For the ordinary skill in the art, above-mentioned term tool in the present invention can be understood with concrete condition
Body implication.
Additionally, in the description of the invention, unless otherwise indicated, " multiple " is meant that two or more.If this
Occur the term of " operation " in specification, it refers not only to independent operation, when cannot clearly be distinguished with other operations, as long as
Can realize that the effect desired by the operation is then also included within this term.In addition, the numerical value model represented with "~" in this specification
Enclose the scope that the numerical value for referring to record before and after "~" is included as minimum value and maximum.In the accompanying drawings, structure
Similar or identical is indicated by the same numeral.
Fig. 1 is referred to, first aspect of the present invention embodiment provides a kind of backlight drive circuit 100.The backlight drive electricity
Road 100 is applied in liquid crystal display, while carrying out luminous with the light source for driving liquid crystal display, also with overcurrent protection work(
Energy.
The backlight drive circuit 100 includes voltage conversion circuit 10, PWM controller 20, voltage-regulator diode Z1, the first electricity
Switch Q1, optocoupler unit 40, boosted switch Qr and light source drive component 30, the voltage conversion circuit 10 are used to connect input electricity
Pressure side Vin, to receive input voltage, and carries out voltage conversion to input voltage, and the voltage conversion circuit 10 is additionally coupled to institute
The light source of optocoupler unit 40, PWM controller 20, the boosted switch Qr and liquid crystal display is stated, the voltage after conversion is defeated
Go out to the optocoupler unit 40, PWM controller 20, the boosted switch Qr and light source, the PWM controller 20 is used to control institute
The output of voltage conversion circuit 10 is stated, the light source drive component 30 is connected to the boosted switch Qr and the light source, with root
The negative electrode of the break-make of the boosted switch Qr, the voltage-regulator diode Z1 is controlled to be connected to the optocoupler unit according to light source situation
The anode of 40, the voltage-regulator diode Z1 is connected to the control end of the first electric switch Q1, the of the first electric switch Q1
One end is connected to the PWM controller 20, the second end ground connection of the first electric switch Q1.When boosted switch Qr short circuits
When, the electric current increase of the output of the voltage conversion circuit 10, the optocoupler unit 40 feeds back to the electricity of the voltage-regulator diode Z1
Pressure is more than breakdown voltage, the voltage-regulator diode Z1 conductings, and then the first electric switch Q1 and turns on, the PWM controller 20
It is stopped to end the boosted switch Qr.
Specifically, the PWM controller 20 includes voltage end, output end, test side and feedback end.The PWM controller
20 voltage end is connected to the voltage conversion circuit 10, to receive operating voltage.The voltage end of the PWM controller 20 also connects
It is connected to the first end of the first electric switch Q1.The output end of the PWM controller 20 is connected to the voltage conversion circuit 10,
To control the output of the voltage conversion circuit 10.The test side of the PWM controller 20 is connected to the voltage conversion circuit
10, with detect the voltage conversion circuit 10 export to the test side voltage be more than preset value when, show occur it is different
Often, the PWM controller is stopped.The feedback end of the PWM controller 20 is connected to the optocoupler unit, described to receive
The feedback voltage of optocoupler unit 40.
It should be noted that the light source is the light emitting diode being connected in series.The anode of the light emitting diode is institute
State the anode of light source.The negative electrode of the light emitting diode is the negative electrode of the light source.The voltage conversion circuit 10 pairs is described defeated
Entering voltage is carried out after voltage conversion as the light source provides voltage, so that the light source luminescent.In the present embodiment, the boosting
Switch Qr short circuits refer to short circuit between the grid of the boosted switch Qr and drain electrode.After boosted switch Qr short circuits, can make
The electric current for obtaining the output of the voltage conversion unit 10 is drastically raised, that is, the electric current for flowing through the optocoupler unit 40 is drastically raised.Institute
The voltage for stating the feedback end that optocoupler unit 40 feeds back to PWC controllers 20 is raised.The voltage of the feedback end of the PWM controller 20
More than the breakdown voltage of the voltage-regulator diode Z1.The voltage-regulator diode Z1 is breakdown, the first electric switch Q1 conductings.Institute
State the voltage end ground connection of PWM controller 20.The PWM controller 20 is stopped, so that the voltage conversion circuit 10
Stop output, the boosted switch Qr cut-offs, the boosted switch Qr surface temperatures reduction not only meets the safety post of safety
Standard, also achieves overcurrent protection.
Further, the voltage conversion circuit 10 includes transformer T, the second electric switch Q2, first resistor R1, the first electricity
Hold C1, the first diode D1, the second diode D2 and second resistance R2, the Input voltage terminal Vin and be connected to the transformer T
The first primary coil first end, and the negative electrode of the first diode D1 is connected to by the first resistor R1, it is described
First electric capacity C1 is connected in parallel on the two ends of the first resistor R1, and the anode of the first diode D1 is connected to described second and establishes by cable
The first end of Q2 is closed, the anode of the first diode D1 is additionally coupled to the second end of first primary coil of the transformer T,
The control end of the second electric switch Q2 is connected to the PWM controller 20, the second end ground connection of the second electric switch Q2, institute
The first end for stating second primary coil of transformer T is connected to the anode of the second diode D2, the second diode D2
Negative electrode the voltage end of the PWM controller 20, the voltage end of the PWM controller 20 are connected to by the second resistance R2
The first end of the first electric switch Q1 is connected to, the secondary coil of the transformer T is connected to the of the boosted switch Qr
One end.
It should be noted that the first resistor R1, the first electric capacity C1 and the first diode D1 constitute RCD
Absorptive unit.The RCD absorptive units are used to absorb the due to voltage spikes of the second electric switch Q2, prevent second electric switch
Q2 is damaged.The second diode D2 and second resistance R2 constitutes rectification unit, with to PWM controller described in input value
The voltage signal of 20 voltage end carries out rectification.
The voltage conversion circuit 10 also includes the 8th resistance R8.Second end of the second electric switch Q2 is by described the
Eight resistance R8 are grounded.
It should be noted that the voltage that the test side of the PWM controller 20 detects is on the 8th resistance R8
Voltage.
The light source drive component 30 includes the 3rd electric switch Q3, control unit 32 and 3rd resistor R3, the 3rd electricity
The control end for switching Q3 is connected to described control unit 32, and the first end of the 3rd electric switch Q3 is connected to the light source, institute
The second end for stating the 3rd electric switch Q3 is grounded by the 3rd resistor R3, and described control unit 32 is additionally coupled to the liter and presses off
Qr is closed, to control the break-make of the boosted switch Qr according to the voltage condition of the 3rd resistor R3.
It should be noted that described control unit 32 includes the first output end, the second output end and test side.The control
First output end of unit 32 is connected to the control end of the 3rd electric switch Q3.Second output end of described control unit 32 connects
It is connected to the control end of boosted switch Qr.The test side of described control unit 32 is connected to second end of the boosted switch Qr.Institute
State control unit 32 controls first output end to export to institute by the current conditions that detection is flowed through on the 3rd resistor R3
The dutycycle of the pwm signal of the control end of the 3rd electric switch Q3 is stated, to maintain the electric current of the light source constant.Described control unit
32 the second output end is used for output pwm signal to the boosted switch Qr, to control the break-make of the boosted switch Qr.It is described
Control unit 32 is additionally operable to detect that second end of the boosted switch Qr is exported to the voltage of described control unit 32, when the voltage
During more than predeterminated voltage, show exception occur, described control unit 32 is stopped.
The backlight drive circuit also includes the 9th resistance R9.Second end of the boosted switch Qr also passes through the described 9th
Resistance R9 is grounded.
It should be noted that second end of the boosted switch Qr export to the voltage of described control unit 32 be it is described
Voltage on 9th resistance R9.
The optocoupler unit 40 includes that the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, voltage are adjusted
Whole device Z2 and optocoupler U, the 4th resistance R4 and the 5th resistance R5 be connected on the secondary coil of the transformer T with it is described
Between the first end of voltage adjuster Z2, second end of voltage adjuster Z2 ground connection, the 6th resistance R6 and described the
Seven resistance R7 are connected between the secondary coil of the transformer T and ground, and the reference edge of the voltage adjuster Z2 is connected to institute
State the node between the 6th resistance R6 and the 7th resistance R7, the anode of the light emitting diode of the optocoupler U is connected to described
Node between 4th resistance R4 and the 5th resistance R5, the negative electrode of the light emitting diode of the optocoupler U is connected to described
Node between five resistance R5 and the voltage adjuster Z2, the first end of the switch of the optocoupler U is connected to the PWM controls
The negative electrode of device 20 and the voltage-regulator diode Z1, the second end ground connection of the switch of the optocoupler U.
It should be noted that the reference edge of the voltage adjuster Z2 provides reference voltage.It is the 4th resistance R4, described
5th resistance R5, the 6th resistance R6 and the 7th resistance R7 are divider resistance.
The voltage conversion circuit 10 also includes the 3rd diode D3, the 4th diode D4 and the second electric capacity C2, institute
The anode for stating the 3rd diode D3 is connected to the anode of the 4th diode D4, and is connected to the secondary wire of the transformer T
The first end of circle, the negative electrode of the 3rd diode D3 is connected to the anode of the 4th diode D4, and is connected to described
The positive pole of two electric capacity C2, the negative pole ground connection of the second electric capacity C2, the second end ground connection of the secondary coil of the transformer T.
It should be noted that the 3rd diode D3 and the 4th diode D4 have collectively constituted rectifier, with right
The voltage of the transformer T outputs carries out rectification.The second electric capacity C2 plays a part of energy storage.
Further, the voltage conversion circuit 10 also includes the 3rd electric capacity C3 and the 4th electric capacity C4, the 3rd electric capacity
The positive pole of C3 is connected to the Input voltage terminal Vin, and the negative pole ground connection of the 3rd electric capacity C3, the 4th electric capacity C4 is connected in parallel on
The two ends of the 3rd electric capacity C3.
It should be noted that the 3rd electric capacity C3 plays a part of energy storage.The 4th electric capacity C4 plays High frequency filter
Effect.
The backlight drive circuit 100 also includes the 5th electric capacity C5 and the 6th electric capacity C6, the positive pole of the 5th electric capacity C5
The negative electrode of the second diode D2 is connected to by the second resistance R2, the negative pole ground connection of the 5th electric capacity C5 is described
The positive pole of the 6th electric capacity C6 is connected to the negative electrode of the 3rd diode D3, the negative pole ground connection of the 6th electric capacity C6.
It should be noted that the effect of the 5th electric capacity C5 and the 6th electric capacity C6 is energy storage.
The backlight drive circuit 100 also includes the 5th diode D5, energy storage inductor L and the 7th electric capacity C7, the described 5th
The anode of diode D5 is connected to the negative electrode of the 3rd diode D3 and the 4th diode D4, institute by the energy storage inductor L
The negative electrode for stating the 5th diode D5 is connected to the anode of the light source, and the negative electrode of the light source is connected to the 3rd electric switch Q3
First end, the negative electrode of the 5th diode D5 is additionally coupled to the positive pole of the 7th electric capacity C7, the 7th electric capacity C7's
Negative pole is grounded.
It should be noted that the 5th diode D5 act as prevent electric current from pouring in down a chimney.The 7th electric capacity C7 is played
The effect of energy storage.
In the present embodiment, the boosted switch Qr, the second electric switch Q2 and the 3rd electric switch Q3 are NPN
The control end of transistor npn npn, the boosted switch Qr, the second electric switch Q2 and the 3rd electric switch Q3, first end and
Two ends are respectively grid, drain electrode and source electrode, and the first electric switch Q1 is NPN type triode, the control of the first electric switch Q1
End processed, first end and the second end are respectively base stage, colelctor electrode and emitter stage.In other embodiments, the boosted switch Qr,
The second electric switch Q2 and the 3rd electric switch Q3 can also be other kinds of transistor.
Fig. 2 is referred to, second aspect of the present invention embodiment provides a kind of liquid crystal display 200.The liquid crystal display 200
Including light source 210 and it is connected to the backlight drive circuit of the light source 210.The backlight drive circuit can be above-mentioned first party
Backlight drive circuit 100 in case embodiment.Because the concrete structure of the backlight drive circuit 100 is in above-mentioned first party
It is described in detail in case, therefore is will not be repeated here.
In the present embodiment, the liquid crystal display includes the backlight drive circuit 100.The backlight drive circuit
100 include that voltage conversion circuit 10, PWM controller 20, voltage-regulator diode Z1, the first electric switch Q1, optocoupler unit 40, liter are pressed off
Qr and light source drive component 30 are closed, the voltage conversion circuit 10 is used to connect Input voltage terminal Vin, to receive input voltage,
And voltage conversion is carried out to input voltage, the voltage conversion circuit 10 is additionally coupled to the optocoupler unit 40, PWM controller
20th, the light source of the boosted switch Qr and liquid crystal display, the optocoupler unit 40, PWM is given by the voltage output after conversion
Controller 20, the boosted switch Qr and light source, the PWM controller 20 are used to control the defeated of the voltage conversion circuit 10
Go out, the light source drive component 30 is connected to the boosted switch Qr and the light source, described in being controlled according to light source situation
The break-make of boosted switch Qr, the negative electrode of the voltage-regulator diode Z1 is connected to the optocoupler unit 40, the voltage-regulator diode Z1
Anode be connected to the control end of the first electric switch Q1, the first end of the first electric switch Q1 is connected to the PWM controls
Device processed 20, the second end ground connection of the first electric switch Q1.When boosted switch Qr short circuits, the voltage conversion circuit 10
The electric current increase of output, the optocoupler unit 40 feeds back to the voltage of the voltage-regulator diode Z1 more than breakdown voltage, described steady
The Z1 conductings of pressure diode, and then the first electric switch Q1 conductings, the PWM controller 20 are stopped to end the boosting
Switch Qr, therefore, the boosted switch Qr surface temperatures reduction not only meets the safety standard of safety, also achieves excessively stream
Protection.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or feature that the embodiment or example are described
It is contained at least one embodiment of the invention or example.In this manual, the schematic representation to above-mentioned term differs
Surely identical embodiment or example are referred to.And, the specific features of description, structure, material or feature can be any one
Combined in an appropriate manner in individual or multiple embodiments or example.
Embodiments described above, does not constitute the restriction to the technical scheme protection domain.It is any in above-mentioned implementation
Modification, equivalent and improvement made within the spirit and principle of mode etc., should be included in the protection model of the technical scheme
Within enclosing.
Claims (10)
1. a kind of backlight drive circuit, is applied in liquid crystal display, it is characterised in that：The backlight drive circuit includes voltage
Change-over circuit, PWM controller, voltage-regulator diode, the first electric switch, optocoupler unit, boosted switch and light source drive component, it is described
Voltage conversion circuit is used to connect Input voltage terminal, to receive input voltage, and voltage conversion, the electricity is carried out to input voltage
Voltage conversion circuit is additionally coupled to the light source of the optocoupler unit, PWM controller, the boosted switch and liquid crystal display, will
Voltage output after conversion gives the optocoupler unit, PWM controller, the boosted switch and light source, and the PWM controller is used for
The output of the voltage conversion circuit is controlled, the light source drive component is connected to the boosted switch and the light source, with root
The negative electrode of the break-make of the boosted switch, the voltage-regulator diode is controlled to be connected to the optocoupler unit, institute according to light source situation
The anode for stating voltage-regulator diode is connected to the control end of first electric switch, and the first end of first electric switch is connected to institute
State PWM controller, the second end ground connection of first electric switch；
When boosted switch short circuit, the electric current increase of the voltage conversion circuit output, the optocoupler unit feeds back to surely
Press the voltage of diode to be more than breakdown voltage, the voltage-regulator diode conducting, and then first electric switch to turn on, the PWM
Controller is stopped to end the boosted switch.
2. backlight drive circuit as claimed in claim 1, it is characterised in that the voltage conversion circuit includes transformer, the
Two electric switches, first resistor, the first electric capacity, the first diode, the second diode and second resistance, the Input voltage terminal connection
To the first end of the first primary coil of the transformer, and the moon of first diode is connected to by the first resistor
Pole, first electric capacity is connected in parallel on the two ends of the first resistor, and the anode of first diode is connected to second electricity
The first end of switch, the anode of first diode is additionally coupled to the second end of the first primary coil of the transformer, institute
The control end for stating the second electric switch is connected to the PWM controller, the second end ground connection of second electric switch, the transformer
The first end of the second primary coil be connected to the anode of second diode, the negative electrode of second diode is by described
Second resistance is connected to the voltage end of the PWM controller, and the voltage end of the PWM controller is connected to first electric switch
First end, the secondary coil of the transformer is connected to the first end of the boosted switch.
3. backlight drive circuit as claimed in claim 2, it is characterised in that the light source drive component is established by cable including the 3rd
Pass, control unit and 3rd resistor, the control end of the 3rd electric switch are connected to described control unit, the 3rd electric switch
First end be connected to the light source, the second end of the 3rd electric switch is grounded by the 3rd resistor, and the control is single
Unit is additionally coupled to the boosted switch, to control the break-make of the boosted switch according to the voltage condition of the 3rd resistor.
4. backlight drive circuit as claimed in claim 3, it is characterised in that the optocoupler unit includes the 4th resistance, the 5th
Resistance, the 6th resistance, the 7th resistance, voltage adjuster and optocoupler, the 4th resistance and the 5th resistant series are described
Between the secondary coil of transformer and the first end of voltage adjuster, the second end ground connection of the voltage adjuster, the described 6th
Resistance and the 7th resistance are connected between the secondary coil of the transformer and ground, and the reference edge of the voltage adjuster connects
It is connected to the node between the 6th resistance and the 7th resistance, the anode of the light emitting diode of the optocoupler is connected to described
Node between 4th resistance and the 5th resistance, the negative electrode of the light emitting diode of the optocoupler is connected to the 5th resistance
With the node between the voltage adjuster, the first end of the switch of the optocoupler is connected to the PWM controller and described steady
Press the negative electrode of diode, the second end ground connection of the switch of the optocoupler.
5. backlight drive circuit as claimed in claim 4, it is characterised in that the voltage conversion circuit also includes the three or two pole
Pipe, the 4th diode and second electric capacity, the anode of the 3rd diode are connected to the anode of the 4th diode, and
The first end of the secondary coil of the transformer is connected to, the negative electrode of the 3rd diode is connected to the 4th diode
Anode, and the positive pole of second electric capacity is connected to, the negative pole ground connection of second electric capacity, the secondary coil of the transformer
Second end is grounded.
6. backlight drive circuit as claimed in claim 5, it is characterised in that the voltage conversion circuit also includes the 3rd electric capacity
And the 4th electric capacity, the positive pole of the 3rd electric capacity is connected to the Input voltage terminal, and the negative pole ground connection of the 3rd electric capacity is described
4th electric capacity is connected in parallel on the two ends of the 3rd electric capacity.
7. backlight drive circuit as claimed in claim 6, it is characterised in that the backlight drive circuit also includes the 5th electric capacity
And the 6th electric capacity, the positive pole of the 5th electric capacity is connected to the negative electrode of second diode by the second resistance, described
The negative pole ground connection of the 5th electric capacity, the positive pole of the 6th electric capacity is connected to the negative electrode of the 3rd diode, the 6th electric capacity
Negative pole ground connection.
8. backlight drive circuit as claimed in claim 7, it is characterised in that the backlight drive circuit also includes the five or two pole
Pipe, energy storage inductor and the 7th electric capacity, the anode of the 5th diode are connected to the three or two pole by the energy storage inductor
The negative electrode of pipe and the 4th diode, the negative electrode of the 5th diode is connected to the anode of the light source, the negative electrode of the light source
The first end of the 3rd electric switch is connected to, the negative electrode of the 5th diode is additionally coupled to the positive pole of the 7th electric capacity,
The negative pole ground connection of the 7th electric capacity.
9. backlight drive circuit as claimed in claim 6, it is characterised in that the boosted switch, second electric switch and
3rd electric switch is NPN transistor, the control of the boosted switch, second electric switch and the 3rd electric switch
End processed, first end and the second end are respectively grid, drain electrode and source electrode, and first electric switch is NPN type triode, described first
The control end of electric switch, first end and the second end are respectively base stage, colelctor electrode and emitter stage.
10. a kind of liquid crystal display, it is characterised in that the backlight drive including light source and as described in claim any one of 1-9
Circuit, the backlight drive circuit is connected to the light source.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710089993.8A CN106710532B (en) | 2017-02-20 | 2017-02-20 | A kind of backlight drive circuit and liquid crystal display |
| US15/535,447 US10311803B2 (en) | 2017-02-20 | 2017-03-29 | Backlight driving circuit and liquid crystal display |
| PCT/CN2017/078634 WO2018149020A1 (en) | 2017-02-20 | 2017-03-29 | Backlight drive circuit and liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710089993.8A CN106710532B (en) | 2017-02-20 | 2017-02-20 | A kind of backlight drive circuit and liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106710532A true CN106710532A (en) | 2017-05-24 |
| CN106710532B CN106710532B (en) | 2019-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710089993.8A Active CN106710532B (en) | 2017-02-20 | 2017-02-20 | A kind of backlight drive circuit and liquid crystal display |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US10311803B2 (en) |
| CN (1) | CN106710532B (en) |
| WO (1) | WO2018149020A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111986625A (en) * | 2020-08-05 | 2020-11-24 | 深圳市华星光电半导体显示技术有限公司 | Backlight driving circuit and display device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110910848A (en) * | 2019-11-28 | 2020-03-24 | Tcl华星光电技术有限公司 | Driving circuit and driving method of liquid crystal display |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN106710532B (en) | 2019-03-26 |
| US20180374430A1 (en) | 2018-12-27 |
| WO2018149020A1 (en) | 2018-08-23 |
| US10311803B2 (en) | 2019-06-04 |
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